<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>角色管理</el-breadcrumb-item>
        <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>

        <el-card>
            <el-row :gutter="10">
                <el-col :span="6">
                    <!-- //添加角色按钮区 -->
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>

            <!-- 角色列表区域 -->
            <el-table :data="rolelist" border stripe>
                <!-- 展开列 -->
                <el-table-column
                    type="expand">
                    <template slot-scope="scope">
                        <el-row :class="['bdbottom',i1 === 0 ? 'bdtop' : '','vcenter']" v-for="(item1,i1) in scope.row.children" :key="item1.id">
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag closable @close="removeRightById(scope.row,item1.id)">
                                    {{item1.authName}}
                                </el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级三级权限 -->
                            <el-col :span="19">
                                <!--通过for循环嵌套渲染二级权限 -->
                                <el-row :class="[i2===0?'': 'bdtop','vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                                    <el-col :span="6">
                                        <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">
                                            {{item2.authName}}
                                        </el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <!-- 渲染三级权限 -->
                                    <el-col :span="18">
                                            <el-col>
                                                <el-tag closable type="warning" v-for="(item3) in item2.children" :key="item3.id" @close="removeRightById(scope.row,item3.id)">
                                                    {{item3.authName}}
                                                </el-tag>
                                            </el-col>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index">
                </el-table-column>
                <el-table-column
                    prop="roleName"
                    label="角色名称">
                </el-table-column>
                <el-table-column
                    prop="roleDesc"
                    label="角色描述">
                </el-table-column>
                <!-- 作用域插槽 用slot-scope获取作用域插槽的值-->
                <el-table-column
                    label="操作" width="300px">
                    <template 
                    slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                        <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>

        <!-- 分配权限 -->
        <el-dialog
            title="分配权限"
            :visible.sync="setRightDialogVisible"
            width="50%"
            @close="setRightDialogClosed">
            <!-- 树形控件 -->
            <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys"
            ref="treeRef">
            </el-tree>
            <template #footer>
                <span class="dialog-footer">
                <el-button @click="dialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="allowRights">确 定</el-button>
                </span>
            </template>
            </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            //所有角色列表数据
            rolelist:[],
            // 控制分配权限对话框的显示与隐藏
            setRightDialogVisible: false,
            // 权限列表
            rightslist:[],
            // 树形控件的属性绑定对象
            treeProps:{
                label: 'authName',
                children: 'children'
            },
            // 默认选中的权限数组
            defKeys: [],
            // 当前准备分配角色的id
            roleId: ''
        }
    },
    created() {
        this.getRoleList()
    },
    methods: {
        async getRoleList(){
            const {data : res} = await this.$http.get('roles')

            if(res.meta.status !== 200){
                return this.$message.error('获取角色列表失败！')
            }

            this.rolelist = res.data
            console.log(this.rolelist)
        },
        async removeRightById(role,rightId){
            //弹框询问用户是否删除权限
        const confirmResult = await this.$confirm('此操作将删除该权限, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => {
          return err;
        })

        //如果用户确认删除，则返回字符串;如果用户取消了删除，则返回字符串cancel
        //console.log(confirmResult);
        if(confirmResult !== 'confirm'){
          return this.$message.info('已取消删除')
        }

        //console.log('确认了删除')
        const {data : res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
        // console.log(res)
        if(res.meta.status !== 200){
          return this.$message.error('删除权限失败！')
        }

        this.$message.success('删除权限成功！')
        //删除后刷新用户权限
        // this.getRoleList()
        // 更新当前角色的权限，不刷新所有用户权限
        role.children=res.data
        },
        // 展示分配权限的对话框
        async showSetRightDialog(role){
            this.roleId=role.id
            const {data:res} = await this.$http.get('rights/tree')
            if(res.meta.status!==200){
                this.$message.error("获取权限列表失败！")
            }
            this.rightslist=res.data
            console.log(this.rightslist)
            
            // 递归获取三级权限节点的id
            this.getLeafKeys(role, this.defKeys)

            this.setRightDialogVisible=true
        },
        // 通过递归的形式获取角色下三级权限的id，并保存到defkeys中
        getLeafKeys(node, arr){
            // 如果当前node节点不包含children属性，则是三级权限节点
            if(!node.children){
                return arr.push(node.id)
            }

            node.children.forEach(element => {
                this.getLeafKeys(element,arr)
            });
        },
        setRightDialogClosed(){
            this.defKeys=[]
        },
        // 点击为角色分配权限、
        async allowRights(){
            const keys = [
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys()
            ]

            // console.log(keys)
            // 将id数组拼接成以逗号相隔的字符串
            const idstr=keys.join(',')

            const {data:res} = await this.$http.post(`roles/${this.roleId}/rights`,{rids: idstr})

            if(res.meta.status!==200){
                return this.$message.error('分配权限失败！')
            }

            this.$message.success('分配权限成功！')
            // 刷新角色列表，关闭权限分配对话框
            this.getRoleList()
            this.setRightDialogVisible=false
        }
    },
}
</script>

<style lang="less" scoped>
.el-breadcrumb {
  margin-bottom: 15px;
  font-size: 12px;
}
.el-card {
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.15) !important;
}
.el-table {
  margin-top: 15px;
  font-size: 12px;
}
.el-tag {
    margin: 7px;
}

.bdtop{
    border-top: 1px solid #eee;
}
.bdbottom{
    border-bottom: 1px solid #eee;
}

.vcenter{
    display: flex;
    align-items: center;
}
</style>